Efficacy of N,N’bis-(2-mercaptoethyl) isophthalamide on mercury intoxication: a randomised controlled trial

Chronic mercury intoxication is a severe health issue and occurs especially in gold mining communities. Common chelators used for improving mercury elimination are not everywhere available and challenged by poor cell wall penetration. This study is part of a feasibility trial and the aim was to gather first information about the efficacy of the newly developed chelator N,N’bis-(2-mercaptoethyl) isophthalamide (NBMI) on chronic mercury intoxication. In this three-armed, placebo-controlled randomised trial, 36 miners with mercury urine levels exceeding 15 ?g/l were administered 100 mg NBMI, 300 mg NBMI or placebo for 14 days. Levels of mercury in urine [?g/l and ?g/g creatinine] and plasma l were analysed. Therapeutic effect was assessed using the medical intoxication score (MIS) and its single health outcomes (e.g. excessive salivation, sleeping problems), fatigue scores, a neuromotoric test battery (CATSYS) and a neurological outcome (Finger to nose test). Physical fatigue was significantly decreased in the 300 mg NBMI group compared to the control. Mercury concentration in urine following 300 mg NBMI treatment was significantly lowered compared to control, however, this effect was less distinct with adjustment for creatinine. NBMI showed an effect on physical fatigue and there were indications to positive effects on other symptoms as well. More comprehensive studies are mandatory to verify the effects of NBMI as a novel tool for treating mercury intoxications.

Authors: Schutzmeier P, Focil Baquerizo A, Castillo-Tandazo W, Focil N, Bose-O’Reilly S. ; Full Source: Environmental Health. 2018 Feb 14; 17(1):15. doi: 10.1186/s12940-018-0358-1.

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